Lesson 2

Explore Big Numbers with Base-Ten Hoppers

Est. Class Sessions: 2–3

Developing the Lesson

Part 2: Study World Population Numbers

Students find the missing population numbers in the 2013 International Populations Rounded to the Nearest Million table in the Student Guide by decomposing and composing numbers using number lines and number sentences. Ask students to look at the strategy Nila used to find the population of females in China.

Ask:

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  • How did Nila find the number of girls in China? (Nila started with the number of boys and made hops on a number line using convenient numbers until she reached the total population.)
  • Nila's number sentence shows 655,000,000 partitioned into 5,000,000 + 300,000,000 + 300,000,000 + 50,000,000. What is another way to partition 655,000,000? (Two possible responses: 600,000,000 + 50,000,000 + 5,000,000 = 655,000,000 or 100,000,000 + 100,000,000 + 100,000,000 + 100,000,000 + 100,000,000 + 100,000,000 + 50,000,000 + 5,000,000 = 655,000,000)

Assign Check-In: Questions 10–13 in the Student Guide. Students will need the World Population Number Line 1 page in the Student Activity Book to complete Check-In: Questions 13. Students can complete these questions independently or with a partner.

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Use Check-In: Questions 10–13 in the Student Guide with the corresponding Feedback Box in the Student Activity Book to assess students' abilities to compare and order larger numbers [E2]; show different partitions of large numbers using number lines and number sentences [E4]; and determine the unknown in an equation involving multiple addends [E6].

Assign the Working with Big Numbers pages in the Student Activity Book for Homework.

Student Guide: 134 135
Answers
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SG_Mini
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Student Activity Book:
Master: